Arc-lamp electrode.



G. EGLY.

ARC LAMP ELECTRODE.

APPLIUATIOH FILED SEPT.9,1909.

Patented Dec. 6, 1910.

UlfllllED STATES PATENT OFFICE.

GEOBG EGLY, OF BERLIN, GEBMANY, ASBIGNOIR TO'GEBRllDER SIEMENS (la (30., 0F LICHTENBERG, NEAR BERLIN, GERMANY.

ARO-LAMP ELECTRODE.

Specification 0! Letters Patent.

Patented Dec. 6. 1910.

Application filed September sif'i'bm Serial No. 516,825.

To all whom it may concern."

150 it known that .l,-.(-}uo1 u Hour, 9. subject of the German lihnperor, and residing at Berlin, Germany, have, in.venluil.-certain new aml useful improvements in Arm Lump lfiloutlrziilcss, of which tho following u specilicutlon. I Y

My invention relates to inciosed aro lumps ulsoue was :1 LE. sljmt oil from the nmiosplwre in such manner that: a f little or no air has not; in them and in which, partiow llllfy', oluoci'ollos which contain illuminating lulniizui'es are employed. The elei'li'oclos for lllQ Slums uiclumps have a plurality of cores coulaining lilo illuminating a mix" '1 or for the. mosl;

Ila and of a shell V pure carbon surall thin as possible it so that ii everywhere of as form strength as p ihla. If the shell were made too thick or 01 unequal strength Pea-i; irregularity in burning; would ho .l in the inclined amps-a. It is velry imporiunt in the of il'mlOSefl lamps Lo diminish the gercentage of carbon in the in .ire elect-rouse, because the carbon is consuurlogfl only exceedingly slowly in such, lamps aml the quail of the illuminating aclmlxiure.-5 whiv i must ho lilPOIlZELi for ob Mining :1 defiuiteglumiuons effect is 138121" lively very much largo than the carbon which is vaporizeo.

By employing a fllumlii-y of cores instead of only one it 1& possihle to make the proporl'ion of the badly conducting core mass to fine good. conducting carbon mass very large and sin'iultaneously to obtain the prim cipul. purpose in 'viow in employing carbon, namely the attainment of very high oongluct-ivit-y of the entire electrode for, in com sequence of the. considerably larger area of COIlliilJll which a plurality of cores guarantees, an excellent conducting connection is ossible between the cores and the shell, but lly forming the Wall of the thin shell uniformly at all parts care must be taken that the electrodes burn uniformly and quietly,

Several embodin'ints of iny'inventlon are represenld by way of example in the; aocom panying drawing.

In and drawing: Figures llo 6 are like views showing various forms of electrodes according to my invention.

If the crow-sectional shape, of :m ohm trodu having several cores which inv lm'cn proposed. heretofore for ordinary upon an; lamps, were used for: inclosod an: humps, nu

extremely unsteady nun-Lmiifoi'm light t-zngl considerable disturbances would lu: out ml s both on accouul of ihe \o'x'sylzirgu w the carbon :sliull anal also on awm; great dilfercn es in the th'ioku'r-ara o? When burned in m llli'lilly open M those l'listvi'b mirm would he HY'Olil pletely ow lo the equalizing; llllll the process of comin of lllQ sinoe any carbon win into the arc urosulijocieu 1 high (logreo to therahy more pull 2' are lumps this equal.- oxistoiu When. my psi-{woo iljeij'ilzlili: forms shown in Figs. 1. in irlclosecl llama lie-m light one; burning; fro-{*- from .i nnu'hances am obtaiuod luring this entire. in g't'll'zfilfil vgry long duration of tho burning; process ofjlthe lamp.

Fig. 1 shows tile moo-suction oi? an {also which can be thou lit o 2. p'lumliiy of imli'vialua oiootmd and-so Qn, "33fil'i of whioii l shells" am iiistiuguishwl in all. figura -s by different cross hatching. can also he made in one piece. in the form represented iii-Fig. 2 by lowing between the individual cores spaces or chambers e, f, 57, but a similar form can also he obtainod with out such. chambers, as re resented in Fig. 3. None of these forms of e ectrode have a Cl]? cular eriphery. If this ho waver, should be desirm Ie. the electrode may be made accord" ing to Fig.- 4 wherein the individual cores 0 have a sector-shaped crossfimtion and the cross-section of the shell 1% has the shape of a. wheel.

It is not, necessa'r' that emh individual core m be surrounde completely on all. sides by a carbon shell. lt only essential um the; thickness of Wall of the shell Wherever there is a surrounding shell, is tl'ironghouh Such eloctrudes ila -eXposed at the outside through slots It, i, k

with the central core, or, represented. in

Fig. 6, in which form the outer cores 0 are provided -in the shell m. It 18 also obvious that one of the spaces .iformed by the shell m and containing the cure material 0 may be left empty without departing from the spirit of llly"ill\entl0ll. So for instance in Fig. (3 the central space I may he left without core material.

Iclaim:

1. An electrode for inclosed flame are lamps consisting of a plurality of cores con- "taining an illuminating admixture, each of said cores being embedded in-a thin carbon shell having a wall of substantially uniform thickness the total cross-sectional area of .said shell being uniformly distributed over the 'whole cross-sectlonal area of the electrode.

' 2. An electrode for inclosed flame are lam s consistin of a luralit of cores contaming an'illuminating admixture, each of said cores being embedded in a thin carbon shell having a wall of substantially uniform thieknessif the shells being arranged and formed 5' ininet-rieallyfin the cross-sectional areaof t e electrode.

3. An electrode for inelosed flame are.

lamps consisting of a plurality of cores containing an illuminating admixture, each of said cores being embedded in a thin carbon shell having a wall of substantially uniform thickness, the shells being arranged and formed symmetrically, and forming together a wheel-like cross-sectional area.

4. An electrode for mcloscd flame are lamps consisting of a plurality of cores contaimng an illuminating adi'nixture, each of said cores being embedded in a thincarbon shell having a -wall of substantially uniform thickness, 'said shells forming together a body'of wheel-like cross-sectional area, said shells being interrupted at symmetrical places.

In testimony whereof I have signed my name to this specification in the presence of two witnesses.

GEORG EGLY. \Vitnesses:

HENRY II \srna, \NoLonMAn HAUPT. 

